Valve-gear of explosion-engines.



(L. DUFOUR.

VALVE GEAR 0E EXPLOSION ENGINES.

APPLICATION FILED OQTu 29. 1913.

Patented Mar. 16, 1915 LEON DUFGUB, 0F GENEVEL, S'WITZEBQANBJ opinion-..

VAINIEQGMB 0]? EXPLOSIONL-ENGINES.

inseam:

ircification of tt -Pa Patented-.Maro '16; 1915;

Application met October 2a, 1913. Serial No. 79?;943;

Ta allfierhdm it may aoneem-r I Be it known that L'Lnon Domini, engineer,:'a citizen of Switzerland, residing at Geneva, Canton of Genevminthe Confed eration of Switzerland, have invented certain" new and usefulImprovements in Valve Gears of I Explosion Engines, of which thefollowing is a specification.

The present invention relates to a-valve gear for explosion engineswherein a slide valve arranged. in a known manner within each cylinderreceives simultaneously a re ciprocating movement along its axis and anoscillating movement around its axis by means of a cross beam movedparallel ,to itself by two crank shafts.

The object of this invention is to arrange arts such as to avoid anywedging and wisting in the working of said valve gear.

In the usual distributing devicesof this kind, the sleeve or slide valvewhich moves longitudinally and rotatively within the cylinder and withinwhich the piston moves to and fro, receives its motion from thetransverse beam which moves parallel to itself by means of a pinpivotally mounted on a projecting part of the inner end part of thesleeve or slide-valve, which pin is placed in a plane perpendicular tothe axis of the cylinder and engages slidably in a corresponding recessof the cross beam. According to the present invention, on the contrary,the movements of the sleeve are produced by the action on protrudingparts of the sleeve itself, of parts rigidly connected with the crossbeam and one of which en gages between two protruding parts of thesleeve and causes the rotative movements of; the sleeve by its actingupon the sides of the said protruding parts, of the sleeve, whereas thelongitudinal movements of the sleeve are caused by other parts rigidlyconnected with the cross beam and which act upon the upper and underfaces of the protruding parts. Thus the parts which actuate the sleevelie in a plane which is nearer to the cylinder axis than is the casewith the usual devices, and consequently the weclging action exertedupon the sleeve is reduced. Heretofore this wedging action exerted uponthe sleeve has been one of the main causes for limiting the efiiciencyof motors of the kind referred to and by the arrangement according tothe present invention, a greatly improved operation of the sleeve orsleeves is --obtained, which results in a material increase of theefficiency of. the motor.

The protruding part of the cross beam engaging with the protruding partsof the sleeve mayadvantageously consist of one pin or more carried bythe cross beam and the axis of which is placed parallel to the axisofthe cylinder and the longitudinal movements of the sleeve in one or inboth directions may advantageously be produced by the cross beam itselfacting upon one or more corresponding faces of the protruding parts ofthe sleeve.

In the annexed drawings two forms of valve gears are shown given asexamples.

Figure 1 is a sectional elevation and Fig. 2 a sectional plan of the oneform and Fig.

3 asectional elevation of the second form of valve gear Figs. 4 and 5show modifications. I

a and a in Figs. 1 and 2 represent crank pins of two like cranks whichimpart a swinging movement tocross beam 1), said cranks which are notrepresented in Fig. l, are mounted fast on shafts c ,'c driven both'atthe same speed from a motor by means of a gear. of tooth wheels, ofring,

chains or any other of the usual elements for transmitting power. Oneend of beam 6 is shaped like a crosshead for a crank pin a and the otherend like a fork-like guide wherein is made to slide along the lengthaxis of the beam a slide piece 03 forming the bearing of a pin a a bolt6 connecting the two ends of the fork. v

On the upper side of beam 6 and in the middleloetween the two crank pinsa pin 6 is caston being embraced by afork-like projectioii f, f of asleeve f and transmitting thereby its movements to the sleeve, only oneend of which is shown in the drawings. Fork 7' f is taken between twoplates gand 9 the first of which is prevented from turning by a stud hand the second is made in one piece witha sleeve 9 surrounding the pin 6both plates kept together by a nut i and another sleeve k whichsurrounds the sleeve 9 and freely turning thereon.

The cross beam 1) transmits to the sleeve 7 a vertical up and downmovement, whereby, besides the friction, the weight of the sleeve has tobe overcome and plate 9 imparts to the fork f f an upward movement andplate 9 a downward movement. Crossbeam 6 however also transmits to theelegy? fio f by means of pin 12 a horizontal oscillating movement.

As shown by Figs. 4: and 5, the distance w of the cross beam causing themovements of the sleeve to the axis of the cylinder is diminished whenusing the device according to the present invention, and therefore thewedging action exerted upon the sleeve 1s correspondingly diminished andan easy and exact movement of the sleeve and an improved operation ofthe machine is obtained, which results in an increase of the efficiencyof the motor.

Instead of imparting the downward movement to sleeve 7 by means of aplate, like plate 9 and instead of having only one fork-like projectionthe downward movement may be transmitted by cross-beam b itself byemploying two fork-like projections of the sleeve, one f f being aboveand the other f f underneath said beam. In this construction bothfork-like projections embrace the same pin Z, whilethe cross beam 5 isprovided at its ends with plates and nuts as shown in Fig. 3. It wouldalso suit the purpose of this invention if there was employed afork-like projection of the sleeve with a pin on the upper side of thecross-beam and a thumb-like projection without a pin underneath saidbeam.

I claim as my invention:

1. In combination with a valve gear for internal combustion enginescomprising a sleeve sliding Within the cylinder and re-' ceiving areciprocating movement in an axial direction and an oscillating movementaround its axis from a cross beam moved parallel to itself by the cranksof two crank shafts driven at the same speed from a motor, a protrudingpart moving with the cross beam and engaging between two protrudingparts of the sleeve to cause partial rotations of the same in oppositedirections and the cross beam itself acting upon the said protrudingparts of the sleeve to cause axial movement of the sleeve in onedirection.

2. In combination with a valve gear for internal combustion enginescomprising a sleeve sliding within the cylinder and receiving areciprocating movement in an axial direction and an oscillating movementaround its axis from a cross-beam moved parallel to itself by the cranksof two crank shafts driven at the same speed from a motor, a pin carriedby thecross-beam and having its axis placed parallel to the axis of thecylinder, which pin engages between two protruding parts of the sleeveto cause partial rotations of the same in opposite directions, theprotruding parts of the sleeve having faces which are resting uponcorrespending faces carried by the cross beam

